Made it with coconut water fresh from the coconut. Intensely savoury and salty. Very intriguing, but not the most enjoyable. I will say I used Appleton Reserve Blend, which may be too characterful.
Sorry to be negative but the word is "lackluster". Maybe, minus the rum (or even with the rum if you like to get started early), it might be okay at breakfast alongside a sprightly Bircher Muesli.
They do add lime in video, before sparkling water. However, they omitted to add caption. Cocktail looks much better with clear coconut water. I should perhaps rephotograph using this. Recipe and video come from this page: https://havana-club.com/en-gb/cocktail/saoco/